Buggy code:
@ Controller @ RequestMapping ( "{projectName}" ) @ SessionAttributes ( "workStreams" ) public class KanbanBoardController { @ Autowired private KanbanService kanbanService ; private Gson gson ; public KanbanBoardController ( ) { } @ ModelAttribute ( "project" ) public synchronized KanbanProject populateProject ( @ PathVariable ( "projectName" ) String projectName ) throws IOException { } @ ModelAttribute ( "projectName" ) public String populateProjectName ( @ PathVariable ( "projectName" ) String board ) { } @ ModelAttribute ( "workStreams" ) public synchronized Map < String , String > populateWorkStreams ( ) { } @ ModelAttribute ( "chartGenerator" ) public synchronized BurnUpChartGenerator populateChartGenerator ( ) { } private Map < String , Object > initBoard ( String boardType , String projectName , String error , String scrollTop ) { } @ RequestMapping ( "wall" ) public synchronized ModelAndView wallBoard ( @ ModelAttribute ( "project" ) KanbanProject project , @ PathVariable ( "projectName" ) String projectName , @ RequestParam ( value = "scrollTop" , required = false ) String scrollTop , @ RequestParam ( value = "error" , required = false ) String error , @ ModelAttribute ( "workStreams" ) Map < String , String > workStreams ) throws IOException { } @ RequestMapping ( "backlog" ) public synchronized ModelAndView backlogBoard ( @ ModelAttribute ( "project" ) KanbanProject project , @ PathVariable ( "projectName" ) String projectName , @ RequestParam ( value = "scrollTop" , required = false ) String scrollTop , @ RequestParam ( value = "error" , required = false ) String error , @ ModelAttribute ( "workStreams" ) Map < String , String > workStreams ) throws IOException { } @ RequestMapping ( "journal" ) public synchronized ModelAndView journalBoard ( @ ModelAttribute ( "project" ) KanbanProject project , @ PathVariable ( "projectName" ) String projectName , @ RequestParam ( value = "scrollTop" , required = false ) String scrollTop , @ RequestParam ( value = "error" , required = false ) String error , @ ModelAttribute ( "workStreams" ) Map < String , String > workStreams ) throws IOException { } @ RequestMapping ( "completed" ) public synchronized ModelAndView completedBoard ( @ ModelAttribute ( "project" ) KanbanProject project , @ PathVariable ( "projectName" ) String projectName , @ RequestParam ( value = "scrollTop" , required = false ) String scrollTop , @ RequestParam ( value = "error" , required = false ) String error , @ ModelAttribute ( "workStreams" ) Map < String , String > workStreams ) throws IOException { } @ RequestMapping ( "{board}//advance-item-action" ) public synchronized RedirectView advanceItemAction ( @ ModelAttribute ( "project" ) KanbanProject project , @ PathVariable ( "board" ) String boardType , @ RequestParam ( "id" ) String id , @ RequestParam ( "phase" ) String phase ) throws IOException { WorkItem workItem = project . getWorkItemById ( Integer . parseInt ( id ) ) ; if ( ! ( workItem . getCurrentPhase ( ) . equals ( phase ) ) ) { <START_BUG> return new RedirectView ( ( ( "..//" + boardType ) + "?error=Could<seq2seq4repair_space>not<seq2seq4repair_space>advance<seq2seq4repair_space>item<seq2seq4repair_space>to<seq2seq4repair_space>the<seq2seq4repair_space>next<seq2seq4repair_space>phase.<seq2seq4repair_space>Probably<seq2seq4repair_space>current<seq2seq4repair_space>board<seq2seq4repair_space>view<seq2seq4repair_space>was<seq2seq4repair_space>not<seq2seq4repair_space>valid." ) ) ; <END_BUG>

Fix:
return new RedirectView ( ( ( "..//" + boardType ) + "?error=Your<seq2seq4repair_space>board<seq2seq4repair_space>view<seq2seq4repair_space>was<seq2seq4repair_space>out<seq2seq4repair_space>of<seq2seq4repair_space>date,<seq2seq4repair_space>your<seq2seq4repair_space>request<seq2seq4repair_space>has<seq2seq4repair_space>been<seq2seq4repair_space>canceled<seq2seq4repair_space>and<seq2seq4repair_space>the<seq2seq4repair_space>board<seq2seq4repair_space>has<seq2seq4repair_space>been<seq2seq4repair_space>updated.<seq2seq4repair_space>Please<seq2seq4repair_space>review<seq2seq4repair_space>the<seq2seq4repair_space>board<seq2seq4repair_space>now<seq2seq4repair_space>and<seq2seq4repair_space>apply<seq2seq4repair_space>your<seq2seq4repair_space>changes." ) ) ;